Preheat the oven to broil and move the oven rack to the highest position. Line a baking sheet with parchment paper and set aside.
In a small bowl, mix together the softened butter, brown sugar and cinnamon until fully blended. Slather each muffin half with the butter mixture.
Arrange on the baking sheet and place into the oven to toast. Toast for 5-7 minutes or until golden.
While the muffins are toasting, warm the dulce de leche in the microwave until it's thin enough to drizzle.
Drizzle the toasted muffins each with around a teaspoon of warm dulce de leche reserving the rest for the tops. If you're using 2 cans of dulce...drizzle to your hearts content!!
Slice the bananas in half lengthwise, then chop into quarters. Divide the banana chunks equally between the toasted muffin halves.
Drizzle each stack of bananas with the remaining dulce de leche.
Top each with a generous dollop of whipped cream. Garnish with fresh mint.